Question

如何使for循环扫描程序代码以一定数量的数量下降？例如，输入30，然后输入3，然后输入30,27,24,21等。

这是我到目前为止所拥有的。我想要表示一次取下多少。

import java.util.Scanner; // ...

public class b
{
  public static void main(String[] args) {  
    int x,y;

    Scanner scannerObject = new Scanner(System.in);
    System.out.println("how many  bottles hanging on the wall");

    x = scannerObject.nextInt();
    System.out.println("how many  bottles are taken down the wall");

    y = scannerObject.nextInt();
    for (int counter = x; counter > 0; counter--)
    {
      if (counter == 1)
      {
        System.out.println(" " + counter + "  bottle hanging on the wall");
      }
      else
      {
        System.out.println(" " + counter + "  bottles hanging on the wall");
      }

      System.out.println("And if one  bottle should accidently fall, ");
    }

    System.out.println("No  bottles hanging on the wall");
  }
}

Answer 1

将x = x - y;放入for循环中。这将使x代表当前挂在墙上的瓶子数量，即，x将在每次迭代时减少3个给定的例子。

Answer 2

将for循环替换为：

for (int counter = x; counter > 0; counter-=y)

这应该会给你想要的输出。

counter-=y更改相当于counter=counter-y

如何使for循环扫描程序代码以一定数量的数量下降？

2 个答案: